Darwin says that mutations always happen. it's the nature of DNA.Well, they’re all natural mutations as far as it goes but it’s Darwin 101 that species will evolve [via mutations] according to environmental pressure. Slower gazelles get eaten so only the faster ones pass on their genes yada yada.
The basics of Darwin can be learnt in an afternoon.
It’s entirely plausible that the vaccines are creating a kind of environmental pressure on the viruses and they are evolving different strains as a result. IOW, similar to how antibiotic resistant strains of bacteria will pop up when antibiotics are over used.
But these are unclean thoughts in the Church of Vax, so lol.
The difference is whether those mutants either succeed ( and become viable in the population) or not